“It was an incredible level of premeditation that you don’t normally see, and it is difficult to believe that a single person could have done this without detection,” Gowdy said. He added that “a lot of crime is prevented because a non-law enforcement officer says something” and that he believes that it is likely we will find out that someone along the way thought that something was suspicious.

“I think we’re going to find someone along the way was suspicious they should have turned that suspicion into a phone call to law enforcement. It’s an incredible amount of premeditation to not go detected,” Gowdy added.

ISIS almost immediately claimed credit for the shooting, though the FBI and family of 64-year old shooter Stephen Paddock have claimed that there are no signs he was involved with an international terrorist organization. So far, no clear motive for the attack on the country concert has emerged.

Police found 23 guns in Paddock’s hotel room and ammonium nitrate in his vehicle — a chemical found in fertilizer that was used in the Oklahoma City bombing. Law enforcement also discovered firearms and explosives at his home.

The police announced that a search of his home uncovered “19 additional firearms, some explosives and several thousand rounds of ammo, along with some electronic devices we’re evaluating at this point.” He had no prior criminal record and was not known to police.

As President Donald Trump boarded a helicopter on Tuesday, he described Paddock as “a sick man, a demented man. Lot of problems, I guess, and we’re looking into him very, very seriously.” He declined to refer to the attack as domestic terrorism, likely as the motive is not yet known.

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